John,
It should not cause any problems provided that the device in question is not
using any kind of dual uplinks. Basically, all portfast does is allow that
port to skip through a majority of the Spanning Tree protocol checking
process. Obviously this is okay for end stations and servers.
We have portfast turned on all the ports in our closet switches and we have
wirless hubs on all floors as well as users who have mini hubs at their
desks and we have not experienced any problems thus far.
Heather - CCNA
-----Original Message-----
From: John Chang [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 01, 2001 9:08 AM
To: [EMAIL PROTECTED]
Subject: Portfast
In the below website it says not to have portfast on if you connect
switches, hubs, or routers. I understand that point but what if a user
connected a mini-hub (Ex. Linksys EtherFast 8-Port 10/100 Desktop Hub)
or unmanaged mini-switch (Ex. Farallon NetLINE 10/100 switch) so that he
could connect multiple computers. Would this cause any problems? Thank
you!
http://www-1.cisco.com/warp/public/473/12.html
Note: The portfast feature should never be used on switch ports that
connect to other switches, hubs, or routers. These connections may cause
physical loops
and it is very important that spanning tree go through the full
initialization procedure in these situations. A spanning tree loop can
bring your network down. If portfast
is turned on for a port that is part of a physical loop, it can cause a
window of time where packets could possibly be continuously forwarded (and
even multiply) in
such a way that the network cannot recover.
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